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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee76cea0b366bfaf072018ea29784050a155e1e04c93b91ea3a25576b727f11a' 
  AND token = 'dvbr7PBoEtvYA8kfzanF+FAA1C0fPUA5/ywsDJ/c/aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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