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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731dca806ed15d711657f9ca10c75e3138968ebe7320dde14320e62fde544a35' 
  AND token = 'da5eRxqGzzxNx4RY+XB9l4q5jmJUull8X4VEByDGqgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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