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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e5dcf4053422f27b1c70e60115d758c9d48a7a839f8f26df5e6aebbae24d7c' 
  AND token = '65ep2lSXXeks0IJMFq/eSUj+9+K7dy2WuPWZ0nwsdTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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