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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e3ae8db03c0d40edc9cdd4960a59f701a26cd8615a387802e0a081f9ee5395' 
  AND token = 'lUDJFBeGyjGb0CA2A6ZguWkSc0icuabadIz6/hJHGCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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