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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185394bdf8f6a84f584752c7e66243d50cf1cc44ac6a79df3b4f8947aac222d2' 
  AND token = 'bPGHqQnATgeOiTdmQXgyGS4zkY78CiSQ27zuLoP0Clc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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