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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e7419373676eaaa3694c1d484ce48b6e4f1dae6c3087c44e6efdd956a49393' 
  AND token = 'qk13TIem+PDdWmnmC+aC2VZALhKBQiC6+vIcpgAxgUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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