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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf764baddc079f7e5a580c8f4b25bdfc7d22cfe72ceee68f0cad655ecfa86de6' 
  AND token = 'r/z9tAX2MH4V+xP5f/KejcTjdf+PyjKQAtP3JRJnj/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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