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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5e49fe5e48608a48847d6c68096a8a52c8ed5476c86f4318562a0fc6d1f2ab' 
  AND token = '/S4chLQr/Ul3E0fesFwp8FnQ2lm5fiS/VEp/fRJvkhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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