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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c92fff468736fc4e02f6af336d2174b409e4a99c8098aa446896673ac10373e' 
  AND token = 'OiWEokZ1h44vZhqQON+ECWX9AceyIPOKx/GcAE+Xi5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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