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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ce4be143e08ea71989c7c3803f182dc82eaf85c3a430625dd6c83498b27682' 
  AND token = 'rsMWZb/Dl9sN8Mo/7C7SZxJa9rHR9Je0Lh8YtfGGMzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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