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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63eec4ba07dba905bb732bfe722a1d78eee82f13e64ac272fbe024a38e7ad98d' 
  AND token = '6uPsG/yMFeLRmJbsjRYv8ocL6wLuW02ABbJJddAjq54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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