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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19684b9a9b7c33e95ebed09f39f466d050e1902181a9d7f743a1113686047271' 
  AND token = 'EwOemuMyGEwWEPQB8NWOqKl1+6NGu30j7KuYEC2hC+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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