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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aca17dd8966671ae930fb07eb398b8c463af4ace6719d872d6962bc44875a0' 
  AND token = 'lbuFZfu4RtIL/47UAVCE3UZ7moXQjndSUqCPO5oVaLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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