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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e47d89f0e36e5d2a3b1582f1d4bfc6f9e80b106aebd8ad5bbca9dade2dd0e57' 
  AND token = 'Bjny2MO+imqudZIacH+JdnAlYne2BsHDasOTmwmP3Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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