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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97c8b1c4371ee4e94567d1384f59e199c365c81abb84553d56c4b6a031cc923' 
  AND token = 'OC8jS4wA/XfEi3rmib9vqW3VMtYW+nAjcymYN3W+XZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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