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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea059eba4a1d8d382ca82b377a3992a4595cb185896d8016ebe10d61d8b42ca' 
  AND token = 'M2CkOmWpdsO49yIy60b9X3v4tQxCzjPxMhb4Gc+7J6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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