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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670f6c87296a179c63e7813799c3bc4123618b0f06c24ca83bc0d4edbfd2acb9' 
  AND token = '1JNtFfDvXYJ+9I9fQ+2hLcL1XwJzpFa0TKuu5kwCmYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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