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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18ee15a08f41b60d66fd22ae0446c5eaa6805f1d7262803716d206a1a77b6f9' 
  AND token = 'PqcNmtWAdqv9QnG0pg81rJU1Eyo541gCQJ3sTg1++gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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