SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388b87ddc0ef2075bc920f1481289bb690842da3944c25c1678d3a0443464245' 
  AND token = 'rogyXzoMrWy/zwxYyBqDNwCQDgZ0mJqQYmOcAA+BdeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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