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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdcf5b4e1ac0712e21a359bb0bc1a260a3a347591e2f9734cab807977c89c9e' 
  AND token = 'm627uZuTenruXuFJU25ZnsBWQandOcrrYc4lsMoCmDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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