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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0047487c55ac1ff6ce10139c9277bf798abb6455106c985c53eba2d543b641' 
  AND token = 'MLDdU3xmTgoEC06UaElATmjxt53w8sC3osBmZ0wq5SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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