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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab081e258d2736f6bb83cca3f6f7d044a14f1ec5091d634c53266a905e6f30f' 
  AND token = '7seCX4fnKwhc2A0drNxW9ITilz/FYIRYAlaEc98S9Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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