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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1470f8ffb48f258830f4d8f86d6bbec74e889f02bc7aef77ba83e90736a7c74' 
  AND token = '2Bt4BP6wOgYtXGRLWM7qk662MRdEAgvo8O/N8OnEHvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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