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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a863aa41da9d1a26fe174c278c9350695587b3b3302ad89027127bc72b9f53' 
  AND token = 'g2DUrISPF01HgjDA3h9xaSII3Vk1/5VIfnuhXt7CVrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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