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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9b50694a7c9ba4b688b595823be7d56a8ecdeaedcd478fa86ddfd3f39804e7' 
  AND token = 'd7SevQDBomp67x1X/Nm1ST/QTPY61aDySi9Or/ec7Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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