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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b199422d74fc9c12e1e97fe6112fefc03d85e00b168d940d8091af8d34d1b4c2' 
  AND token = 'eeWXlj8VYHjCwW6I4Ld0LLHiNakVIezx9P8XoJFF1EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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