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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7df4152ebac934ec9e99e912f155f1f6acf2db4886bc86b8805c743afa24c9' 
  AND token = 'CH1dw6NWqcUZqeK63eYX663P1AIKVB3Ib+JxKePwIUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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