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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68b5c48a379c1577930aae087cbe93ab2ff1bd750c259dba450b45e5cf2e51e' 
  AND token = 'SS5OcjvNOR+wWY80xyp2KhZOYA0cznEkrYDooRRvul8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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