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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686e9417f172d34a5524e823f8a89309fde5ed3e6fe8c8af35ade37d5e7b24ef' 
  AND token = '3oX6+JovpJuZ8EZYeeOJenjF0ZoMTXLPsCazngUC9ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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