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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3caf6808f29ccd2bbd5f5a2663cd8cc64c94515f3bd1bfdd9f90edd36334cd' 
  AND token = 'YumgnfXsEY415KagfgWEOH8n7lu0XVczUC0QPbvJysY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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