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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942d6de6ba4d242540b3a3bfc4701d55d003463b440315f0e021501fd798f692' 
  AND token = '3mjmbDOAq0bHrss8OoiEg8NvkRYjfcYpnpcUcyJs0r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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