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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c8d44208f0985ad18ed92c933248fffcc8d77a5f285bc7b22e283ec8a4ce5e' 
  AND token = '3RYa/NRLWjMdi8kJUOdXdbSv2EozLWaiD7iV0EVPHE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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