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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7138dc7d1957b8252c4da3c9d5959f0e869598e436077120d6f41c1e63e8c7bb' 
  AND token = 'Vty2gXH81OHaQlnFmEARZ0RpQv6T+I3TBhweTpNZtM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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