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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a30eaff04ff426cb58e080dc84619a332fa5d433765cb8b99c568e5fff93cc' 
  AND token = 'R8mOcFDASYceewP/eO+7Gn3SCBY3dqZMAIecHKD+7B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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