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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59972708f718e9540639199edb92e027e6a450c4cd79cfa95d8c23fe3fd47d4e' 
  AND token = 'AsgpZ0rAY9i8jbZP1SsH1RInSh4j/hSgY8xBoz6rF5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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