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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacf490751cc8db439c5a03c0396e0ef3b22d48cdeda32da8927ee490f123788' 
  AND token = 'jPWaKVSY1j7HgMOwXyhcczQBpGZIrwzchxfrf7cgTNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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