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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f95ac959abe6f52f246a526360ff0ab528ada8288bf3e35e456f8ae741c768' 
  AND token = 'QKxW2t4Xq7F20tCA5MwxfkO8VEPM/L6ncWCNbv+viSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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