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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a012d2a0c4b6afbe1f0339b0b51f7048e9302bf0cf75e16b4da7614b3ed5d01' 
  AND token = 'U31uWM4AG9nP09J8F6rXlhMzgGVZNf3mav6vK+98TZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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