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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af556e8fdfbe1159a83b2e42838411c85f29174562429b9bf99f4c2c16a26aa2' 
  AND token = '+Acu8IVh6bXgoSGpJLwEQhoU2HEBQC8G2Xose269Jj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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