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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbf79dac19996d4bf13cbfa05ee4d1698c66e4b3331b97d09eab9e78e033fdc' 
  AND token = 'U4xc2Q+Rh8yPP+/N7F3g/VJ83IB5qN6pq9BF0wEl9ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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