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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcc7f1cc5a0e9214ac68f19d0726b36ebee724ae35d9bf569a4b7ab6786c0b2' 
  AND token = 'SSjlY7XoTEuj8+SgxmuYfamjXdAGaW4RUfEdMi/27lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}