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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdbe9b7e4517e49eaf1d9926e9eb86c4d8b610ae7f3effa635aec5acd0e1898' 
  AND token = 'Orubsw4xz01vcUdsOc+gAV3L0Gn0xdkOTvl/aWCFqMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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