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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e819201788698d90ea27a7f39e392fb04f46f8fcb982efd297f1d88812ea1e36' 
  AND token = 'DczbKkDsYmgxB6MTxHoTK4Gm7kYiQRAgTcSNEQcPxTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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