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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0755cc1a4726a5ee860141eca90831d4929c2b47e768889c0405b39774a68abb' 
  AND token = 'ukxlgqff8rkpOEco3Mb49N5HhDp0/xjOdtCLDYhOPYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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