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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf140d56b2e00bfd3ef0826b05675c363e270e101d46bc0110c9dfb44e7f38d2' 
  AND token = '76X2LiUdzNceJ19wfDXpVm88Kf8naus1HH7eVrI0tEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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