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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69e80d0074a8afb296988e008ae062ea028d63f922b0e9a86e44086744b801d' 
  AND token = 'Hy8tlcYvEfPgiLfZc7LBhmyTIzhZPKSiKrFBNS1iOvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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