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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f7ac51613998b0e0878dea639933fcafa5759b160b48f2fd3d710b8479cad0' 
  AND token = 'I/FkkM7kxzCmqGo8UP3YzAzpwf9d/9QgXmo+iLLPExM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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