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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b604100901cd23a6438e96321f6ecb8359a79f25961f51060529ad40074331b6' 
  AND token = 'q5FbJMfUF+Y3lYir0PhCXlg2md6NM74fU1KVRirUIhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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