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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7c99f2f5e6eb46c800e3ede49007db8d22ee42ca0babebb56695e5c65d9139' 
  AND token = '2TzaGE0uPLgAO+tM2dz85SniC9r30usgHY0CeR/LTqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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