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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7311ac28ca7e3a99188508962dd58f33028ba540b627d6cfffe7c471f5329661' 
  AND token = 'Q1wWxcM8/pPcI0iAMueCfXSuyGOAVL6DCgKz1l6wt08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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