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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58575180ef20f1a083e01c974732c4dec9af5ab33381b5def20ed6d3bdddc6ef' 
  AND token = '/hklUsGn7m06fh58V4FCzRYXgy3hxnavDNGaWf/u7fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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