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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f0a67cdf5ff3801b5f1679270556faea336ec35b2179cb197f6718eefedff9' 
  AND token = 'NF+WB71D8U6YrhpY8UN/1w1wJNs53CZo/ehxL8bZQWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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