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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfbd5b0b41de5d47f2fb79a7e8682eb33b748479120a68608d7ec040bc60b7a' 
  AND token = 'TmLLiH34meuFod5r2AJtJVluoSDLr5TuiBSYmnJ+ac0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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