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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e676a8b258b7107f40cda778d8abeebee1fd2f828a1e064e6b9a1517f5f38c19' 
  AND token = 'sUirkmvNjbsG+RJ+K5AHEb1HU+cY6xhngdPRFuGsy2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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