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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a0f197c9223def6a65fd05cd8c7e344065ffebe3d109874dd066a9d874689a' 
  AND token = 'VI33TiXnkRuhVQgscPeeCG4XpK6BJFmHxkaImyNPJbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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