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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec14ab0cbdbecf391da0401de6d692092cfd9f87f5f4fa8b709ab73c7ceef74' 
  AND token = 'zIciu5AIgHVzoajoskA/GwXt0rONRxIKasoC6CEYE4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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