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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde921fac47663fb6ffa56e6938b99d75e2c9bd69b46be62d8a21a1c0bb09342' 
  AND token = 'uSvs4rjsDp5xoN7a3WBcxeqI29D5oipXiUUoQyBOsX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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