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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66e429892f68026c45d8ae21475ae2a513e21ab7033667b75881819995189a8' 
  AND token = '+pErTYWFDntSaR3OJYyasOHrfmTpf0Se/ovSNTnjc/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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