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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f55aa519c610d388e46a83c8c1a82716327457a0be09ea765bef21c7ab9219' 
  AND token = 'PC7P7sv7gR5JHM5gxd8ygQgvI9WiCUPOx9TuQZyji8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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