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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d6666a9ece18df295cfaf486370f5ed070db90c1e67f4ea46afe61773db12e' 
  AND token = 'HYA4FhtdsjscwipwRHUSE1o6oHaGmFIXqkBBa1w8KmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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