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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9bec02b3740dedb71679b5ca917e376569b657fc0bf5ff7e9bc05627363cf2' 
  AND token = 't/fm4GuSvsObwE8ZemAqHU47o2vUcOYhrjO8Ipz297Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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