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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ccbf66f18545556ac0e9ff75df4b88875d624abd5c01e04f71507b12d8c2b7' 
  AND token = 'EX4C5wKFm3ps2GSkj9du//gxNErhPg/+3PHX76F4SyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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