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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839eb15cff4292c9cc363019530f0371987e272969882fb13b08929a63fd6ff9' 
  AND token = 'k6AL+PqsNt9XOcZR4Zv3soXKAYgaV2OGV3vIDpoCkCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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