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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e59043b99557597305b8acbc9f3c44750ee2b092baa7141cd2c2e989bec9dc' 
  AND token = '3nbTbrssElGGsixVUoTTG5SwyVxDj6Pqp+HcUDpMEHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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