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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a92544272f0661778a50251e97efe97edebb16a6bdeb66c8f38404971214c5' 
  AND token = 'AnaGkKSaG15l92q4fi9vDNrQXl9FvIlCR+2PPXv0HkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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