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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0841fa0c1efebafa9d90549dc3baca772e1c0d4dbafc519095550597acebe2' 
  AND token = 'ggRi5xm5186ho7vdh3hV+T562sucnRoIlqJ1A/xsT+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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