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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308c8b3e9e27a15726028639ef2030f02ed1b72e151dd4a354db6e01aee96929' 
  AND token = 'YxzECuHdGv/m9AEWzxHSSHl+Y0AHxubwg8mk9G43+Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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