SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd545e1a0c76b028564dc5e4713f4a623da31eecf8985349387f5d2e13bfaddb8' 
  AND token = 'vdJFbO5ZeNOH5r9MD7KnWgwdtG/vKL+I8wRMPHPh1+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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